You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Rachel Robinson here. I would like to change my recent reservation, can you help me with this?

ASSISTANT: I am happy to help you with that.

USER: Thank you.

ASSISTANT: Can you please wait for a while.

USER: Sure, take your own time.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for your contacting us, have a great day.