You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ashley Lee.

ASSISTANT: How can I help you today?

USER: I would like to travel from SFO to ATL. Can you please help me to book a ticket?

ASSISTANT: Sure, I am here to help you with that, can you share me your travelling dates?

USER: My travelling dates will be on 12/23 to 12/25.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Is there any time concern?

USER: I want to return in the evening.

ASSISTANT: Can you have any other specifications?

USER: I do not have any other specifications.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights are found on your desired route.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.