You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is David Thompson.

ASSISTANT: How may I assist you?

USER:  I am planning to travel from SFO to DFW to attend my sister's wedding, could you please help me with booking a flight ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: The travelling dates are from 04/05 to 04/07.

ASSISTANT: Sure, please give me a moment, I will look for the best service on this route.

USER: Ok.

ASSISTANT: According to your dates, there is 1 flight available with UA airlines, shall I proceed your booking?

USER: You can proceed booking my ticket.

ASSISTANT: Your ticket is confirmed, flight number is 1000.

USER: Thank you for your help.

ASSISTANT: You are welcome. Have a safe journey.