You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: As my planned trip has been postponed to some other dates, I need your help in changing my recent reservation details.

ASSISTANT: Sure. Please let me know your name?

USER: I had booked the ticket with the name Christine Walker.

ASSISTANT: Ok. Let me check your recent reservation details.

USER: Sure, take your own time.

ASSISTANT: Sorry, no reservation found by your name.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you.