You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for the day?

USER: Can you please help me to modify the ticket details in the existing reservation?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: Thank you. My name is Eric Hall.

ASSISTANT: I have found your previous reservation with your name. Can you please share your new preferable airport codes?

USER: That's good to hear from your end, please search a flight from the airport PHX to SFO.

ASSISTANT: May I know your new travelling dates?

USER: The preferable travel dates are Mar 17 and Mar 19.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight to travel.

ASSISTANT: Sorry for the inconvenience, there is no direct flight found on this route as per your details.

USER: It's ok, not an issue. Thank you for your time.

ASSISTANT: Most welcome, thank you for reaching us. have a great day.

USER: You are most welcome.