You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am David Allen. I need to cancel my recent reservation due to my scheduled examination dates has been postponed. Can you please help me?

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Fine, thanks for the information.

ASSISTANT: Thanks for reaching us.