You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me to book a ticket from SEA to SFO?

ASSISTANT: Kindly mention your travelling dates?

USER: Ok, please can you book a ticket for the dates Nov 9th and Nov 11th?

ASSISTANT: Do you prefer any lay by in between journey?

USER: Ok, please book a flight which has single limit.

ASSISTANT: May I know your name?

USER: My name is Justin Lewis.

ASSISTANT: Is there any another specifications on your trip?

USER: No.

ASSISTANT: Please wait a moment.

USER: Ok, take your own time.

ASSISTANT: Sorry Justin Lewis, we haven't found any flights based on your specifications.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thanks for reaching us.