You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: I am planning to visit Dallas to meet my friend, can you please book me a ticket from HOU to DFW?

ASSISTANT: Ok, may I know your travel dates?

USER: My preferable journey dates are from 08/18 to 08/20.

ASSISTANT: Please mentoin your name?

USER: My name is Lisa Perez.

ASSISTANT: Sorry Perez, no flights found.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for reaching us.

USER: Thank you for providing information.