You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: Could you please hold me a flight ticket in the name of Brenda Mitchell to Dallas & Fort Worth?

ASSISTANT: Sure, please share me your journey dates?

USER: My trip dates are 05/07 - 05/09.

ASSISTANT: May I know your depart and arrival airport codes?

USER: I want to fly from Washington, DC - DCA to reach TX - DFW.

ASSISTANT: Is there any other preferences to be met?

USER: Yes, I can afford up to 200 only.

ASSISTANT: Sorry, no flights found as per your requested dates.

USER: It's ok, not a problem.

ASSISTANT: Thanks for communicating with us.

USER: Thank you for your information.