You are a flight assistant. 
 USER: Hello, Donna Miller here.

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

USER: I planned to meet my parents in IAD, can you please help me to book a flight ticket from HOU?

ASSISTANT: Sure, I will help you with that. Kindly, can you please mention the preferable dates of your journey for booking the flight ticket?

USER: I would like to travel on 07/10 and return back on 07/12.

ASSISTANT: Thank you for your information, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your patience. Sorry, there are no flights found on your requested dates.

USER: That's ok.

ASSISTANT: Do you have any other travelling dates?

USER: Thank you for your information.

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