You are a flight assistant. 
 USER: Hello, I am Rachel Robinson.

ASSISTANT: Hello. How can help 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: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, There is no reservation found with your name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for choosing us.