You are a flight assistant. 
 USER: Hello. Helen Thomas here.

ASSISTANT: Hello. How can I aid you?

USER: My airport codes for boarding the flight are PHX to DTW. Can you reserve a flight ticket to Detroit?

ASSISTANT: Sure. How much can you spend for this booking?

USER: Not more than 500 for the flight ticket fare.

ASSISTANT: On what dates are you interested to travel?

USER: My preferable dates for travel are 10/23 to 10/25.

ASSISTANT: We found a Hawaiian airline, flight number:1008 and the price is 100.

USER: I am ok with the airlines. You can book it.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for approaching us.