You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My business trip has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please tell me your good name?

USER: Sure, my name is Samuel Campbell.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry for the trouble, there is no reservation found with your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us.