You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jack Baker.

ASSISTANT: How may I help you?

USER: I would like to book a ticket from HOU to DFW, can you please help me out?

ASSISTANT: Sure, I am glad to help you. May I know your travelling dates?

USER: I am travelling on these dates DEC 18th and 20th.

ASSISTANT: Do you have any specifications?

USER: I need departure time afternoon.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Ok no problem, thank you for reaching us.

ASSISTANT: Thank you for reaching us.