You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Richard White here. I need to reserve a ticket from SEA to OAK, can you help me in doing that?

ASSISTANT: Sure, which class would you prefer to travel?

USER: I am comfortable with any class.

ASSISTANT: Kindly mention the dates of your journey.

USER: I am willing to travel on Apr 24 and return on Apr 26.

ASSISTANT: How many maximum number of connections would you prefer in between your journey?

USER: I need a single connection.

ASSISTANT: Do you have any other requirements?

USER: My departure time must be in evening.

ASSISTANT: Ok, please wait. I will check the availability of flights and get back to you.

USER: Ok.

ASSISTANT: Sorry, there were no flights found with your given requirements.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.