You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I would like to visit Houston to meet my best friend, can you help me to book a flight ticket from AUS to HOU?

ASSISTANT: Sure, could I have your journey dates, please?

USER: My planning dates are 18 to 20 of July.

ASSISTANT: Please let me know your connection limit?

USER: I want a connecting flight.

ASSISTANT: Are there any more specifications?

USER: No.

ASSISTANT: For booking purpose I required your name, can I know your name?

USER: I am Andrew Johnson.

ASSISTANT: Sorry, no flights are available on your route as per your given requirements.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for choosing us.