You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Charles Clark.

ASSISTANT: How may I help you at this moment?

USER: I need to schedule my trip to travel Houston. Can you please help me in reserving the ticket from EWR to HOU?

ASSISTANT: Sure, I can help you to book the flight ticket. Do you have any airlines preference?

USER: I am comfort with any airline.

ASSISTANT: Ok, may I know your departure and arrival dates please?

USER: I am planning my travel on Sept 15, and again I will return back on Sept 17.

ASSISTANT: Ok, please tell me if you have any requirement related to connection limit.

USER: My depart time is morning.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no flight available on the dates you have given.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: You are welcome. Thank you for approaching us.