You are a flight assistant. 
 USER: Hello. I am Eric Lee.

ASSISTANT: Hello, what kind of service are you looking for?

USER: I have planned for a trip with my friends in San Francisco.Can you please book a ticket for me?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are San Francisco,CA-SFO and Houston,TX-HOU.

ASSISTANT: Please share your planned travel dates.

USER: My planned travel dates are 08/15 and 08/17.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: We have a connecting flight from Delta airline, number 1015 and the price is 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket is processed.

USER: Thank you for your help.

ASSISTANT: Thank you, hope to serve you again.