You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me in booking my flight ticket from IAD to PHX?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My depart day is July 28th, my return date is on July 30th.

ASSISTANT: Could I have your name please?

USER: I am Christopher Thomas.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I am ok, with connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: My depart time should be in the morning.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Its ok, thank you.

ASSISTANT: You are welcome, have a great day.