You are a flight assistant. 
 USER: Hello. I am Charles Carter.

ASSISTANT: Hello, how can I support you?

USER: I want to change my existing reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check with the reservation list and revert to you.

USER: Sure, take your time.

ASSISTANT: Thank you for your time, we did not find any reservation on your name to change it.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for opting us.