You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Andrew Smith.

ASSISTANT: How may I assist you?

USER: There is a change in my reservation dates, can you help me in changing the reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: There is no reservation found on this name, do you want to make a new booking from us?

USER: No, anyway thank you for your information.

ASSISTANT: Thank you for contacting us.