You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you now?

USER: Owing an emergency I had request for this change reservation.Can you please help me to change an existing reservation?

ASSISTANT: Sure. Let me know your name for further process to change the reservation.

USER: I am Emma Collins.

ASSISTANT: Ok, please wait a while.

USER: Sure.

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

USER: That's not a problem. Thank you.

ASSISTANT: Thank you for reaching us.