You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Charles Allen. Can you help me in booking my flight ticket from IAH to SFO?

ASSISTANT: Sure, please help me with your travelling dates.

USER: My trip dates will be Apr 21st to Apr 23rd.

ASSISTANT: Ok, Do you prefer direct flight or connected flight?

USER: I prefer a connecting flight.

ASSISTANT: Ok, Do you have any class preference?

USER: I need a economy class.

ASSISTANT: Ok, Do you have any specific preferences regarding timings of your journey?

USER: My depart time is evening.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, we found a connecting flight in 1028 Southwest Airlines with a fare of 300. Can I proceed for booking?

USER: You can proceed if it matches my schedule.

ASSISTANT: Sure, your ticket has been booked and depart time is 21:00PM.

USER: Thank you.

ASSISTANT: Thank you for contacting us.