You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rachel Roberts.

ASSISTANT: What can I do for you now?

USER: I am planning to attend a food festival at PHL to taste different varieties of food items. Can you please book a ticket on 01/19?

ASSISTANT: Ok. May I know your preferences, so that it will be easy to book a ticket?

USER: I need connecting flight.

ASSISTANT: Your source point please.

USER: Source code is Houston, HOU.

ASSISTANT: Help me with your return date please.

USER: Return is on 01/29. Return is on 01/21.

ASSISTANT: Thanks for being patience. Unfortunately, there were no flight with your information.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us. Have a good day.