You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Linda Lewis.

ASSISTANT: Nice to meet you Linda Lewis.

USER: Nice to meet you too. Suddenly my travelling dates was changed, can you help in changing my reservation?

ASSISTANT: Ok, please wait a moment I will revert you back with the preferable information.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found with your name to change it.

USER: Thank you very much.

ASSISTANT: Welcome, have a good day.