You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Ashley Robinson.

ASSISTANT: How may I guide you?

USER: I need to book a flight ticket from DEN to AUS. Please help me in booking a flight ticket.

ASSISTANT: Ashley Robinson, I am here to help you for this. When would you like to travel?

USER: My journey dates are from Mar, 02 and Mar, 04.

ASSISTANT: At what time your planning to depart and return time?

USER: I need to depart in the evening and I do not have any restriction in return time.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: No problem, thanks for your information.

ASSISTANT: Thank you very much for contacting our agency.

USER: Most Welcome.