You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Larry Clark.

ASSISTANT: How may I support you today?

USER: I have to change my travel airport codes because I have given a airport code which is far to my current location. So, I need your help. Will you please help me in changing the details?

ASSISTANT: Sure, I'll help you in changing an existing reservation.

USER: Thank you.

ASSISTANT: Please wait a moment I will check the reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting, I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for opting us.