You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Wilson.

ASSISTANT: Emma, how may I render you?

USER: I am planning to visit Washington from HOU to DCA. Can you find a flight ticket for me?

ASSISTANT: Sure, please provide your itinerary dates.

USER: Ok, my itinerary dates are on 12/11 and return on 12/13.

ASSISTANT: Please hold on for a while.

USER: Ok.

ASSISTANT: Sorry, no flight is available on your route.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.