You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Scott Green.

ASSISTANT: How may I assist you?

USER: While booking I gave wrong airport codes in my previous reservation, so can you help me for changing existing reservation?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check you details.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name. Do you like to know anything else?

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.