You are a flight assistant. 
 USER: Hi, Shirley Collins here.

ASSISTANT: Hello, how can I best assist you today?

USER: Could you please avail me a flight ticket from San Francisco, CA - SFO to reach Denver, CO - DEN?

ASSISTANT: Sure, on which dates would you like me to book a flight ticket for you?

USER: My trip dates are 11/13 - 11/15.

ASSISTANT: Do you need any restrictions on your ticket fare?

USER: I can afford up to 200 only.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We are glad to inform that, there is a flight found in Delta airline of flight number 1019 and fare is 100. Shall I proceed for booking?

USER: Please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thanks for contacting us, have a nice journey.