You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am Alexander Parker, planning to visit Austin. Can you please book me a ticket from LGA to AUS?

ASSISTANT: Sure, may I know on what dates you need booking?

USER: My planned dates of journey are from 08/27 to 08/29.

ASSISTANT: Sorry, there is no plane on your requested travelling dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us, have a great day.