You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me to change my reservation due to an emergency?

ASSISTANT: Sure, can you please provide me your name?

USER: Gregory White here.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Gregory White, we have found an active reservation. Can you provide your new airport codes?

USER: My airport codes are PHX to SFO.

ASSISTANT: Please provide me your itinerary travel dates.

USER: My travel dates are Mar 16 and Mar 18 respectively.

ASSISTANT: Is there any connection limit?

USER: I prefer for single connecting flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: I would like to arrive in the afternoon.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: I regret to inform that there are no flights on your route with the given dates.

USER: No issue, thanks for the help.

ASSISTANT: Thank you for reaching us.