You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Janet Thompson.

ASSISTANT: How can I assist you?

USER: I want to postpone my journey, please help in changing my reservation.

ASSISTANT: Sure. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by the above name to change it.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.