You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Charles Jones. Please help me in changing my recent reservation.

ASSISTANT: Yes, I have found reservation on your name. Can you tell me your new travelling dates?

USER: July, 24 and July, 26 are my travelling dates.

ASSISTANT: Could you share me your nearest airport codes?

USER: SFO and PHX are my airport codes.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight and my return time should be at morning.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for consulting us.