You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Frank Thompson. I have to change the destination airport code in the previous ticket because the planned trip is changed due to some issues. Can you please help me to change the details?

ASSISTANT: Sure, please wait a minute.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Most welcome.