You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Margaret Harris.

ASSISTANT: How can I help you now?

USER: I had planned to go on a trip, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Please, wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.