You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I got a best social service award from the minister of Washington, so help me in booking my flight ticket to attend the award function there.

ASSISTANT: Sure, when are you planning to travel?

USER: I need to go on 08/04 and back on 08/06.

ASSISTANT: Let me know your airport codes.

USER: I will takeoff from IAH and land at DCA.

ASSISTANT: May I know your name?

USER: Sure, I am Amy Hernandez.

ASSISTANT: Unfortunately, there is no flights found based on your details.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.