You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you at this moment?

USER: I am Rebecca Mitchell. I have to change my flight ticket booking that I am unable to attend the trip, can you please help me in flight ticket modification?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for few minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.