You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to meet my friend after his marriage at Washington, IAD. So please help me in booking a flight ticket from Houston, HOU?

ASSISTANT: Sure, I can help you. May I know your name?

USER: My name is Janet Perez.

ASSISTANT: When would you like to travel?

USER: My journey dates are from 06/14 to 06/16.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found according o your requriments.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thanks for your information.