You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you?

USER: Will you help me in booking the flight ticket from IAD to HOU?

ASSISTANT: May I know your preferable dates to go?

USER: My preferable journey dates are 09/10 and 09/12.

ASSISTANT: Wait a moment.

USER: Ok, take your own time.

ASSISTANT: Thanks for your time, there is no flight for you.

USER: Ok, not an issue.

ASSISTANT: May I know your name for the documentation purpose?

USER: Myself David Gonzalez.

ASSISTANT: Thanks David Gonzalez, have a good day.

USER: Thank you for your information.