You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER:  I have to change my travel airport codes because I have given a airport code which is far to my current location. So, I need your help. Will you please help me in changing the details?

ASSISTANT: Sure, may I know your name?

USER: I am Charles Edwards.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: We found a reservation with your name. Kindly share your airport codes.

USER: My source is PHX and destination is OAK.

ASSISTANT: May I know your travel dates?

USER: My journey dates are Apr 14 to Apr 16.

ASSISTANT: Do you have class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, please share any other preferences.

USER: I am looking for a connecting flight which return in evening.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: No issue, thank you.

ASSISTANT: Thanks for reaching us.