You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I want to change an existing reservation because my trip dates has been changed. Can you help me to change this reservation?

ASSISTANT: Ok, let me know your name so that I can help you easily.

USER: Please check with the name Paul Carter.

ASSISTANT: Thanks for giving your name, please wait for while.

USER: Sure, I will wait.

ASSISTANT: Thanks for your patience, I could not able to find a reservation on your name.

USER: It's not a problem. Thank you for checking.

ASSISTANT: Thanks for approaching us.