You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have booked a flight ticket to New York city to attend a meeting but due to some issues in the office, our manager decided to conduct the meeting in Phoenix. So, I need to change the travel airport codes. Can you please help me in changing the ticket details?

ASSISTANT: Ok, can you please tell me your name?

USER: Thank you. My name is Sandra Baker.

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

USER: It's ok, not a problem with that. I will contact some other agency to change the details. Anyways thank you for spending your time for me.

ASSISTANT: It's my pleasure.

USER: You are welcome.