You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Let me know your name to check the reservation status?

USER: Mark Martinez here.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, I have not found any reservation on your name to change.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for approaching us.