You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Charles Carter.

ASSISTANT: How can I serve you?

USER: I am looking for a flight from DEN to EWR, can you help me in booking the flight ticket.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: On what dates you are interested to travel?

USER: Sure, my travel dates are 06/18 and 06/20.

ASSISTANT: How much can you spend for this reservation?

USER: I can afford only 200.

ASSISTANT: We found a Spirit airline, flight number:1028 and the price is 100.

USER: Thank you for your service.

ASSISTANT: Your flight ticket has been reserved. Thank you.