You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Donald Edwards. I would like to travel from AUS to PHL to explore global culture. Can you please reserve me a flight ticket?

ASSISTANT: Sure, May I know your travelling dates?

USER: I am planning to depart on Dec 13 and return on Dec 15.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I have to depart in the afternoon time and return in the evening time.

ASSISTANT: Is there any other specifications?

USER: No, I don't have any other specifications.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, no issue. Thank you for the information.

ASSISTANT: Thank you.