You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I got an appointment in hospital which is Houston, can you book a ticket for me?

ASSISTANT: Sure, may I know your journey dates please?

USER: My journey are from 05/19 till 05/21.

ASSISTANT: Ok, please provide me your airport codes.

USER: My source is from OAK, and destination is HOU.

ASSISTANT: Please help me with your name.

USER: My name is Jessica Turner.

ASSISTANT: Jessica, please wait for a moment.

USER: Ok.

ASSISTANT: As per your requirements, I have found a ticket with Delta airline and flight number is 1022. Shall I proceed?

USER: Proceed it.

ASSISTANT: Your ticket has booked. Have a safe journey.

USER: Thank you for your service.

ASSISTANT: Welcome. Thank you for contacting us.