You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Ruth Gonzalez here. I am planning to meet my friend in Austin, AUS. could you please help me with booking a flight ticket from DEN?

ASSISTANT: Sure, may I know your respective dates of journey please?

USER: My respective travel dates are from Apr 28 to Apr 30.

ASSISTANT: Please wait for a moment to check for the availability of a ticket.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry Ruth, there is no flight found as per your travelling details.

USER: Ok, no problem. Anyway, thank you for the information.

ASSISTANT: You are welcome.

USER: Thank you for your kind service.