You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rachel Turner.

ASSISTANT: How can I help you?

USER: I am planning to visit Philadelphia, can you please book me the ticket from HOU to PHL?

ASSISTANT: Sure, I am glad to help you. Would you please share your trip dates?

USER: My preferable journey dates are from 04/26 to 04/28.

ASSISTANT: Sorry to inform you that, there are no flight found on your trip dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us, have a great day.