You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to modify my destination airport code because the place where I have to go is not near to that destination airport. Can you please help me to change the details?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Let me know your name to check your reservation?

USER: My name is Sandra Clark.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait for your reply.

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: It's ok, not a problem with that.

ASSISTANT: Thank you for choosing us.

USER: Thank you for a checking my ticket status.