You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Cynthia Perez here.

ASSISTANT: How can I aid you at this moment?

USER: I would like to visit Houston to meet my grand parents there, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Can you please mention your travel dates for booking flight ticket?

USER: Thank you. My departure date is on 12/14 and please book my return ticket on 12/16.

ASSISTANT: May I know your preferable airport code names for further process?

USER: My nearest genesis airport code is IAD and I would like prefer HOU as my destination airport code.

ASSISTANT: Ok, please give me a moment.

USER: Take your time to check but try to bring a best flight in my route.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: Oh! Sad to hear that. Anyway, I will go with another airlines to complete my journey. Thank you for the information.

ASSISTANT: You are welcome.