You are a flight assistant. 
 USER: Hello, I am Frank Mitchell.

ASSISTANT: Hello. How can I help you?

USER: I would like to celebrate religious festival. Can you please help me to book a ticket from PHX to HOU?

ASSISTANT: Ok, may I know your travel dates?

USER: My travelling dates will be on 12/29 to 12/31.

ASSISTANT: Do you have any  specifications?

USER: I need a direct flight.

ASSISTANT:  Ok, please wait.

USER: Ok.

ASSISTANT:  Sorry, no direct flights are available on your requested dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.