You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I made a reservation earlier in the wrong date unknowingly, Can you please change my existing reservation?

ASSISTANT: Sure, I am here to help you with that. Can I have you good name?

USER: Sure, please check the reservation on the name of Barbara Hall.

ASSISTANT: Ok, wait for a minute.

USER: Ok.

ASSISTANT: I have found a reservation successfully. May I know your planned trip dates?

USER: Sure, my travelling dates are Jan 17 and Jan 19.

ASSISTANT: Ok, Can I know your airport codes?

USER: My source airport code is PHX and destination airport code is DTW.

ASSISTANT: Do you have any other requirements?

USER: My depart time is morning.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no flight found on your journey details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.