You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Sandra Edwards.

ASSISTANT: How can I assist you?

USER: I would like to visit NASA space center at Houston. Can you help me in booking a ticket from SEA to IAH?

ASSISTANT: Sure Sandra, can I know the travel dates please?

USER: I am planning my journey on dates 03/17 and 03/19.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: There is a flight in Delta airline with price 200, can I book it?

USER: Ok, please book the ticket.

ASSISTANT: Your ticket has been booked with flight number 1000.

USER: Thank you for your assistance.

ASSISTANT: You are welcome.