You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I have your name please?

USER: I am Timothy Walker.

ASSISTANT: Timothy Walker, how shall I support you?

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

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait,  I will check the reservation on your name.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. We found that there was no reservation with your name.

USER: Ok, no worries.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.