You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Timothy Collins. I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Please wait a while.

USER: Thank you for that. I will wait for your response.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: OH! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: Thank you for contacting us.

USER: Most welcome.