You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning my holiday trip visit Houston. Can you please help me in reserving the ticket from PHL to IAH?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I will depart on Dec 20, and again I will return back on Dec 22.

ASSISTANT: Do you have any airline preferences?

USER: I am comfort with any airlines.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I am flexible with direct flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No, I don't have any other requirements.

ASSISTANT: Can you please provide your name to proceed further?

USER: Myself Thomas Green.

ASSISTANT: There is a direct flight with ticket fare 100 in UA airlines in economy class. Is it ok for you?

USER: Yes, please go ahead and reserve the ticket.

ASSISTANT: Your booking is confirmed with flight number 1013. Departure time is 15:00 PM and arrival time is 18:00 PM.

USER: Thank you very much for reserving the ticket.

ASSISTANT: Thank you for contacting us, have a nice day.