You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Margaret Roberts.

ASSISTANT: How can I assist you today?

USER: I need some help in my flight ticket booking due to an emergency, so can you please help me in flight ticket booking from OAK to LAX?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I have planned my dates on 05/16 and back on 05/18.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

USER: Sad to hear from your end but anyways, thank you for your search and information.

ASSISTANT: Welcome, have a great day.

USER: Welcome.