You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to fly to Washington with a connection, Can you help me with this?

ASSISTANT: Sure, may I know the travelling dates?

USER: My travelling dates would be from 02/18 to 02/20.

ASSISTANT: Please send me your airport codes.

USER: I will start my journey from IAH to DCA.

ASSISTANT: Can I know your name?

USER: I am Rachel Wilson.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. Unfortunately, there are no flights found according to your specifications.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.