You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me in modification of my reservation as I am not able to make my trip?

ASSISTANT: Sure, I am here to help you out. May I know your name please?

USER: Thank you for considering my request. My name is Christine Collins.

ASSISTANT: Ok, please give me a moment.

USER: Sure, I will wait for your response.

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

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for approaching us.