You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I need to change my source airport because due to some work I came to Boston, can you please help me to change the ticket details?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Could I have your name please?

USER: My name is Dorothy Clark.

ASSISTANT: Ok, please allow me a moment.

USER: Ok, take your time. I can wait for your response.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes.

USER: Oh! That's sad to hear from  your end. Anyhow thank you for checking my ticket status.

ASSISTANT: You are welcome, have a great day.

USER: You are welcome.