You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Angela Campbell.

ASSISTANT: How may I guide you Angela Campbell?

USER: In a hurry, I have given wrong airport codes. So, I would like to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, please wait a moment I will check it out and let you know.

USER: Ok.

ASSISTANT: Actually, there is no reservation under your name.

USER: Ok, that's fine. Thank you for the information.

ASSISTANT: Thank you for reaching us.