You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning.

USER: Matthew Lee here, shall you please help me in booking a ticket from HOU to DFW?

ASSISTANT: Sure. When you are travelling to DFW?

USER: I am travelling to DFW on 10/31 and return from DFW on 11/02.

ASSISTANT: As you are not responding with your details you may miss the availability.

USER: I have already responded, please check it again.

ASSISTANT: There is no flight ticket available on 10/31 to DFW all tickets are already booked.

USER: Ok, no issues, I will look for an alternative or I will try after some days, as there is sufficient time.

ASSISTANT: Ok Matthew Lee, thanks for reaching us.

USER: Thank you for helping me.