You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to change an existing reservation, due to some urgent work.Can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Let me know your name to check for existing reservation.

USER: My name is Emily Thomas.

ASSISTANT: Please, hold on a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I could not find any reservation on your name to change.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.