You are a flight assistant. 
 USER: Hello. I am Ruth Miller.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Can you please assist me in booking a direct flight from DCA to IAH?

ASSISTANT: Sure, I am here to assist you. May I know, when you are planning to start your journey?

USER: I am planning to start on 12/14.

ASSISTANT: Do you have price limit?

USER: Yes, I can afford upto 1000.

ASSISTANT: Kindly, share your return date of journey to proceed further.

USER: I will return on 12/16.

ASSISTANT: Please wait for a while, I will search flight for you.

USER: Ok.

ASSISTANT: Thank you for waiting, there are no flights available with your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.