You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me with changing my reservation due to my planned event got postponed?

ASSISTANT: Sure, please share your good name?

USER: Thank you. Myself David Allen.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your given name.

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

ASSISTANT: Thank you for choosing us.

USER: Most welcome.