You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I hand help to you?

USER: Can you please help in changing my details in an existing reservation?

ASSISTANT: Yes, I am glad to assist you. May I know your name for checking purpose?

USER: I have reserved my flight ticket in Edward Baker name.

ASSISTANT: Baker, I am unable to find your previous booking in our back end to modify it.

USER: Ok, fine thank you for your help.

ASSISTANT: Thank you for your valuable time in approaching us.