Detailed Instructions: In this task, you're given a dialogue between a customer and a flight booking agent with a gap in the conversation. Your job is to find the answer of the previous dialogue. Avoid using irrelevant extra information while creating the answer. The answer should be relevant to the question before the blank. If you fill the blank with a question, it should have an answer from the agent in the given dialogue. Fill the gap marked with underline.
Q: customer: Hello. 
 agent: Hello, how can I assist you today? 
 __ 
 agent: Sure, please wait for a while. 
 customer: Sure. 
 agent: Sorry, there was no reservation found with your given name. 
 customer: It's ok, not an issue. Thank you for the information. 
 agent: Thank you for opting us.
A:
customer: I am Brenda Thompson. Please, help me in changing my existing reservation as my plan to attend a seminar got postponed.