You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Myself Paul Gonzalez. I am planning to meet my friend at Dallas, will you help me in booking the flight ticket from DCA to DFW?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates to book a flight ticket?

USER: My preferable journey dates are May 05 and May 07.

ASSISTANT: How much you can afford for your ticket?

USER: As, my budget is low I can afford only up to 200.

ASSISTANT: Do you prefer any economy class or business class?

USER: I am comfortable with any class. I need a flight with single connection.

ASSISTANT: Ok, wait for some time I will check the availability of flights on your details and get back to you.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for approaching us.