You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Pamela Mitchell want to travel to DC-DCA to attend Food festival.

ASSISTANT: Ok.

USER:  Can you book a ticket from TX-DFW?

ASSISTANT: Sure, I am happy to help you. Could you please share your depart and arrival dates?

USER: I will depart on 10/05 and arrive on 10/07.

ASSISTANT: How much you can afford for this journey?

USER: I can afford 500 for the journey.

ASSISTANT: Are you willing to travel in economy class?

USER: I am comfortable with any class.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patience, there were no flights found on your given specified dates.

USER: Thank you for your response.

ASSISTANT: Thank you for opting us.