You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Myself Shirley Phillips, can you assist me in booking a flight ticket from IAD to HOU?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. May I know your preferable travel dates?

USER: Ok, my travel dates are 04/05 and 04/07 respectively.

ASSISTANT: Ok, please wait a moment.

USER: Yes, take your time I will wait.

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

USER: Ok, not a problem. Thank you for assisting me.

ASSISTANT: Thank you for reaching us.