You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I would like to change my reservation which is under my name, as my holiday trip has been postponed. Can you please help me with that?

ASSISTANT: Sure, I am here to help you for this. Could you please provide me your name?

USER: My name is Donald Walker.

ASSISTANT: Please wait for a while, let me check your reservation status in our records.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, no reservation is found with your criteria.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you very much for connecting with us.

USER: You are welcome.