You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Richard Harris.

ASSISTANT: How can I help you?

USER: Please help me to book a flight ticket from HOU to PHL.

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: Sure, my travelling dates are from May, 02 to May, 04.

ASSISTANT: Ok, do you have any connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Ok, may I know your arrival and departure time?

USER: I need to return in the morning.

ASSISTANT: Sorry, no flights are available on your route.

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: Welcome, have a nice day.