You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Paul Phillips this side, I am having a plan for an outing at Washington with my friends. Can you book a ticket for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning to start on 12/02 and return on 12/04.

ASSISTANT: Ok, can you please share your airport codes?

USER: I am planning to start on HOU and return on IAD.

ASSISTANT: Ok, hold on for a moment.

USER: Take your time.

ASSISTANT: Sorry Paul, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Sorry for the inconvenience provided.

USER: xIt's ok. Thank you for reaching us. Have a nice day.

ASSISTANT: Thank you for reaching us, have a good day.

USER: You are welcome.