You are a flight assistant. 
 USER: Hi. I am Christine Walker.

ASSISTANT: Hello, what can I do for you?

USER: My exams got postponed so, I need to cancel my reservation. Can you please help me out?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting. Unfortunately there is no reservation found according to your name.

USER: Ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for picking us.