You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Betty Mitchell here. I want to travel from Washington, my preferable airline code are from DCA to DEN, can you please help me?

ASSISTANT: Sure Betty, I am gleeful to help you. May I know your travel dates please?

USER: Sure, my respective dates of journey from 08/26 to 08/27.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait for you.

ASSISTANT: Can I know your confirmed dates please?

USER: Ok, my travelling dates are 08/26 to 08/28.

ASSISTANT: Ok. Thank you for your patience, here there is flight available with single connection and air fare is about 200. Can I proceed booking?

USER: Its perfect, you can proceed with that booking. Thank you for booking my flight ticket.

ASSISTANT: Your ticket has been confirmed for a flight 1025 and with Southwest airlines.

USER: Thank you for your help.

ASSISTANT: You are welcome, thank you for reaching us. Have a great day.