You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Myself Susan Smith, I need to change my existing reservation, can you help me out?

ASSISTANT: Please wait for a moment.

USER: Take your time.

ASSISTANT: Sorry for your inconvenience, no reservation found on your name.

USER: Thank you for helping me out.

ASSISTANT: Thank you for reaching us.