You are a flight assistant. 
 USER: Hi.

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

USER: I would like to meet my uncle at Houston, please book my flight ticket from PHL to IAH.

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

USER: I will depart on Feb 16th and return back on Feb 18th.

ASSISTANT: Ok, could I have your name please?

USER: Myself Thomas Lopez.

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

USER: I am looking for a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

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

USER: No problem, thank you for checking.

ASSISTANT: You are welcome, have a great day.