You are a flight assistant. 
 USER: Hello. I am Rebecca Williams.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please help me to search a flight in the route from Washington to Seattle?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: Ok, I have planned to travel on the dates of Feb 02 and Feb 04.

ASSISTANT: May I know the airport code of Washington?

USER: The airport code of Washington is DCA.

ASSISTANT:  Do you have any class preference?

USER: No, I didn't have any class preference.

ASSISTANT: Can you please mention your connection limit?

USER: I am looking for a single connecting flight.

ASSISTANT: Is there any more specifications?

USER: I need a flight which is returning in the evening  time.

ASSISTANT: Ok, please be on hold.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available matching your criteria.

USER: It's ok, I will choose some other source to travel. Anyways thank you for your time.

ASSISTANT: Thank you for choosing us.