You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Elizabeth Lee.

ASSISTANT: Lee, what can I do for you?

USER: Owing to an emergency, I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, I can do that for you. I will check your reservation status and get back to you.

USER: Ok, take your time.

ASSISTANT: Lee, I did not find any reservation by your name in our database.

USER: Its ok, thank you for the information.

ASSISTANT: You are welcome and thank you very much for choosing us.