You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I'm planning to meet my college professor, cam you book a ticket from DFW to PHL?

ASSISTANT:  Sure, may I know your travelling dates?

USER: Sure, my planned departure and return travel dates are 19th and 21st of July.

ASSISTANT: On which name shall I reserve flight ticket?

USER: Please book the ticket with the name Emma Turner.

ASSISTANT: Do you need any specifications?

USER: Yes, I'm looking for single connected flight.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: Oh! That's ok, thank you.

ASSISTANT: Thank you for reaching our service.