You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I have to change  my reservation due to my planned event got postponed. So please  help me with that.

ASSISTANT: Sure, I am here to help you with that. May I know your good name?

USER: Thank you. Please check the reservation with my name John Hall.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

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

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

ASSISTANT: Thank you for reaching us.

USER: Most welcome.