You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I guide you?

USER: Can you please help me to book a ticket from LAX to DTW?

ASSISTANT: Sure, can I know your travel dates?

USER: My travelling dates are on May 07 and May 09.

ASSISTANT: On which airlines do you want to travel?

USER: I am comfortable with any flight.

ASSISTANT: Ok, please tell me your name.

USER: My name is Mark Johnson.

ASSISTANT: Sorry to intimate you that, there are no flights found in this route with the dates you have given.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome. Thank you for choosing us.