You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Cynthia Martin here.

ASSISTANT: What can I do for you Cynthia Martin?

USER: I have some urgent work in office, So, can you change my reservation?

ASSISTANT: Sure,please hold for a moment, I will check with your recent reservation.

USER: Sure.

ASSISTANT: Thank you for your time. There is no existing reservation find on your name in our data base.

USER: That's fine.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.