You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Laura Baker here.

ASSISTANT: How may I help you?

USER: Due to health issue, I want to postpone my trip. Will you please help me in changing my reservation?

ASSISTANT: Sure, wait a moment.

USER: Ok.

ASSISTANT: Sorry Baker, no reservation has been found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.