You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that you are expecting from my side?

USER: Actually my planned trip got postponed, so can you please change the  details?

ASSISTANT: Sure, let me check with your information in our previous ticket booking list.

USER: Sure, take your time.

ASSISTANT: Can I have your name please?

USER: I am Charles Parker.

ASSISTANT: I am unable to find your previous reservation in our ticket booking list.

USER: It's ok, not a problem with that. Anyways thank you for checking.

ASSISTANT: You are most welcome and thank you for contacting us.