You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Please help me to book a flight ticket with the normal cost airline from TX to attend my sister's marriage in WA.

ASSISTANT: Sure, I will help you. May I know your planned travel dates please?

USER: I need to depart on Jan 19th and my return date will be on Jan 21st.

ASSISTANT: Can I have your airport codes clearly?

USER: My source point is IAH and my destination point is SEA.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your airline preference?

USER: I already mentioned above.

ASSISTANT: May I know your name please?

USER: I am Emma Allen.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: I found an economy class in Delta airlines with fare 100 and it has single connection. Can I book your ticket?

USER: That's fine, you can proceed with the booking.

ASSISTANT: Ok, your booking is confirmed with flight number 1008.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you for choosing us.