You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to book a ticket from HOU to PHL, can you help me?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are 07/18 and 07/20.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Can I know your name?

USER: I am Jennifer Thompson.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok. Thank you for your help.

ASSISTANT: Most welcome.