You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Wilson.

ASSISTANT: What guidance do you need from our agency?

USER: I would like to book a ticket to Austin, can you please help me out?

ASSISTANT: Sure, I will help you in ticket booking. Please mention your travelling dates.

USER: I am travelling on these dates 12/23 and 12/25.

ASSISTANT: Ok, what are your source and destination airport codes?

USER: I am flying from PHX to AUS.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Sorry for the trouble, there are no flights found with the details you have given.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome. Thank you for reaching us.