You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Christopher Smith.

ASSISTANT: How may I help you?

USER: I had planned to go on a vacation, but it was postponed.Can you change my recent reservation?

ASSISTANT: Sure, I am happy to help you. Give me a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found on your name.

USER: That's ok, no issues. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.