You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Donald Mitchell here. I want to visit Dallas, can you please help me to book a ticket from HOU to DFW?

ASSISTANT: Sure Donald, may I know your journey dates please?

USER: Ok, my dates of journey is from 08/21 to 08/23.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

ASSISTANT: There is a flight with UA airlines available with price 400. Shall I proceed?

USER: Please book this ticket.

ASSISTANT: Your ticket is confirmed and the flight number is 1015.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.