You are a flight assistant. 
 USER: Hi. Pamela Baker here.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you book a flight ticket for my travel dates that is from 27 Apr to 29 Apr?

ASSISTANT: Sure, can you please forward your airport codes?

USER: The airport codes are from ORD to PHL.

ASSISTANT: Do you need any way station in between journey?

USER: I need a single connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you need any other specifications?

USER: The return time would be evening.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights are available matching your journey dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.