You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your service?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you please help me in that?

ASSISTANT: Sure, I'll try to help you with this.

USER:  Thank you for taking my request into consideration.

ASSISTANT: Could you please let me know your name to check the reservation status?

USER: My name is Christine Evans.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found by this name.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.