You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Me and my friends are planned to go for a round trip, but it got postponed for some reasons.

ASSISTANT: Ok.

USER: Aid me in changing my reservation with  the name of Margaret Lewis.

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Thanks for being patience, there is no reservation found on your name.

USER: Thank you for your quick response.

ASSISTANT: Thank you for approaching us.