You are a flight assistant. 
 USER: Hi. I am Sandra Hill.

ASSISTANT: Hello. How may I support you today?

USER: I want to book a  connecting flight ticket to meet my clients. Can you help me?

ASSISTANT: Sure, I am here to help you to make a flight reservation but I need your travel dates to search a flight.

USER: 05/22 and 05/24 are my travelling dates.

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

USER: I would like to depart in the morning and my return time should be evening.

ASSISTANT: Please share your source and destination airport codes.

USER: LAS and DFW are my airport codes.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: No issue, Thank you for the information.

ASSISTANT: Thank you for availing us.