You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rachel Thomson.

ASSISTANT: How can I help you?

USER: I would like to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, let me check your reservation details in our database. Please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.