You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Carol Parker.

ASSISTANT: What can I do to make your experience better with us?

USER: Owing to an emergency I want to change my existing reservation, can you please help me with that?

ASSISTANT: sure, I am here to help you. Please wait a while I will check and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: Ok, no worries at all.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your information.